<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../../assets/heima.png" alt />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主题 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="istoggle?'64px':'200px'">
        <div class="toggle-button" @click="toggleBtn">| | |</div>
        <el-menu
          :default-active="activePath"
          class="el-menu-vertical-demo"
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409eff"
          unique-opened
          :collapse="istoggle"
          :collapse-transition="false"
          router
        >
          <!-- 一级菜单 -->
          <el-submenu v-for="(item, index) in leftData" :key="item.id" :index="item.id+''">
            <!-- 一级菜单的模板区 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsFont[index]"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item
              v-for="subItem in item.children"
              :key="subItem.id"
              :index="'/'+subItem.path"
              @click="saveNavState('/'+subItem.path)"
            >
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{subItem.authName}}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右边页面主题 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>


<script>
export default {
  data() {
    return {
      leftData: [],
      iconsFont: [
        "iconfont icon-users",
        "iconfont icon-tijikongjian",
        "iconfont icon-shangpin",
        "iconfont icon-danju",
        "iconfont icon-baobiao"
      ],
      istoggle: false,
      // 被激活的链接地址
      activePath: ""
    };
  },
  methods: {
    logout() {
      sessionStorage.clear("token");
      this.$router.push("/login");
    },
    async getMenuList() {
      const { data: res } = await this.$http.get("menus");
      if (res.meta.status !== 200) return this.$message(res.meta.msg);
      this.leftData = res.data;
    },
    // 点击按钮显示菜单折叠与展开
    toggleBtn() {
      this.istoggle = !this.istoggle;
    },
    // 保存链接的激活状态
    saveNavState(v) {
      sessionStorage.setItem("activePath", v);
      this.activePath = v;
    }
  },
  created() {
    this.getMenuList();
    this.activePath = sessionStorage.getItem("activePath");
  }
};
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}
.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  transition: all 0.3s;
  background-color: #333744;
  .toggle-button {
    background-color: #4a5064;
    color: #fff;
    text-align: center;
    font-size: 10px;
    line-height: 24px;
    cursor: pointer;
  }
  .el-menu {
    border-right: none;
  }
}
.el-main {
  background-color: #eaedf1;
}
.iconfont {
  margin-right: 10px;
}
</style>
